Action may not be taken over WA cop punch on woman

Two police officers allegedly involved in a violent incident with an indigenous woman in Western Australia's north may not face disciplinary action, Commissioner Karl O'Callaghan says.

Video has emerged on social media that appears to show a male officer punching a woman in the head, while another male officer pins her to the ground.

Isaiah Barney, who filmed the incident in Kununurra in the early hours of December 5, told AAP his sister and another woman had been fighting when police intervened.

Mr Barney says the video features the other woman.

Mr O'Callaghan said an internal review into the incident may not result in disciplinary action.

"It doesn't mean to say officers will lose their jobs either - it may mean we may have to do some better training or change some circumstances, who knows, or maybe nothing will come out of this," he told 6PR radio on Thursday.

"If we don't do it, then the Corruption and Crime Commission will do it, so we have to have a look at these things, make sure we have our training right, that the officers have done the right thing."